Chromium compounds of azodyestuffs and process of making same.



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GADIEHT E NGI AND CARL JAGERSPACHEB, 0F BASEL, SWITZERLAND, ASSIGNORS TO- 50013 OF CHEMICAL INDUSTRY IN BASIIE, OF BASEL, SWITZERLAND.

"HIUM OOMBOUNDS OF AZODYESTUFFS .AND PROCESS OF MING To all whom it may concern: I Be it known that WB QEJ GADIENT Error and Dr. CARL JAGEBSPACETER, both chemists, citizens of the Swiss Republic, and residents of Basel, Switzerland, have invented new Chromium Compounds of Azodyestuils and Processes of Making Same, of which the following is a full, clear, and exact specification, t We have found that new chromium compounds of azodyestufis containing groups able to combine with chromium, can be obtained by combining the hitherto unlmown chromi compond of an or'thooxydiazobody with an azodyestud-component containing at least one group able to be chromated, The thus obtained products contaming chromium can be employed for dyeing from an acid bath, whereby they lurnish tints which are intermediatebetween those of the corresponding azodyestuds themselves and those of the subsequently chromated dyeings obtained by treating the dyeings obtained with the said azodyestuds subsequently with a chromate,

ins preparation a. "the new chromium compounds of orthooxydiazobodies, used as intermediate products of the corresponding orthoaminophenol compounds as for instance l-zQzl-nitroaminophenol, 2:1 :d-aminophenol sulionic acid, picramic acid, an orthoaminonaphtholsulionic acid, or of the sodium salts of these derivatives of orthoaminophenol with a chromium compond, as for instance chromium oxid or a chromium salt, and diazotizing the tens obtained chromium compound. of the 'orthoaminophenolccmpounds according to the usual methods; for this latter operation, the. solution of the chromium compound obtained after boiling and cooling down may be employed directly or the chromimum compound of the orthoaminophenolcompounds can be isolated from this solution, by evaporation, etc., and afterward dissolved again before it is diazotized The combination of the thus obtained chromium' compound of orthrooxydiazobodies;

which are yellow to brown substances soluhis in water, with an a'zodyestufi containing t in the new process 1S edected by boiling aqueous solutions y Specificationof Letters retain. P t t an 19 11g, Application filed-November 29,1915. Serial m, 64,028. i

at least one group able to be chromated as, for Instance, a phenol, an aminophenol, a naphthol, an aminonaphthol, or one of their sulfoderivatives occurs also according to known niethods, whereby half chromated orthoo xyazodyestuds are obtained.

The process for the manufacture of these compounds is illustrated by the followingexamples. I 1 Example 1': 15A parts 4:2:1-nitroaminophenol are heated with 350 parts water,

13.6 parts crystallized sodium acetate and 11 parts chromium fiuorid for 3 to 4x hours at 100 C. in a vessel provided with a reflux I bined with 1:8:3:6-aminonaphtholdisulfonic acid in a sodaalkaline solution. The obtained dyestufi solution is filtered hot and the half chromated dye. is precipitated from the filtered liquid by adding common salt. The dyestutl can eventually be purilied by redissolution,

1t dyes wool from acid bath blue ts while the sodium salt of the dyestuff 4:2 :1.- nitrodiazophenol l :8 i3 z-aminonaphtholdisulfonic acid dyes wool from an acid bath red-violet tints. iastness to washing alkalis and light is essentially improved and these fastness properties are between those of the dyeings obtained with the specified sodium salt of the dyestud and those of the same dyeings subsequentlytreated with a chromate. By treating subsequently the dyeings of the half chromated dyestuffs with a chromate the same green tints oi" the same fastness properties are obtained as by treating subsequently the dyeings of the sodium salt with a chromate.

1 Example 2: 18.9 parts 2:1 z-aminophenolsulfonie acid are transformed with 300 parts water and iparts sodium hydrorid into the corresponding sodium salt, The filtered solution is united to a filtered solution of 105 parts chromium fluorid in 100 sodium-betanaphtholate.

parts waterand to a similar Solution of 27.2 parts crystallized sodium acetate and the I trated, diazotized in the known manner and combined with a soda alkaline solution of The solution of dyestufl' is. heated in order to dissolve the part1 separated dyestufi and filtered; from the ltered liquid the dyestufi is precipi- "tated by addition of common salt and eventually purified by redissolution. The dyestufi' dissolves in water to Bordeaux-red coloration and in concentrated sulfuricacid with light blue-red coloration and it dyes.

wool from an acid bath brownish Bordeauxred tints, while the sodium salt of the dyestufiorthoaminophenolsulfonic acid+betanaphthol dyes wool pure red tints. The fastnesses to washing, alkalis and light are essentially improved; they are intermediate between those of the dyeings obtained with the said sodium salt and those of these latter dyeings subsequently treated with chromates; by treating subsequently the dyeings of the half chromated dyestufi with a chr0- mate the same violet tints are obtained as by treating subsequently with a chromate the dyeings of the specified sodium salt of the dyestutf.

Example 3: 19.9 parts picramic acid are boiled with 1750 parts water, 10.5 parts chromium fluorid and 13.6 parts crystallized sodium acetate, for about 15 hours, in a vessel provided with a reflux cooler and then filtered hot. There remains a residue I. The filtered liquid is concentrated by evaporation, whereby'a precipitate II separates,

which is isolated by filtration and suction.

Both parts I and II of the new chromium compound are diazotized inknown manner and united with a sodaalkaline solution of 1: 8 2 4-aminonaphtholdisulfonic acid. In both cases the diificultly soluble dyestufl is precipitated and is separated by filtration from the mother-lye free of dyestuff. The dyestufl' is then extracted with water, the thus obtained solution is filtered and from the filtered liquid the dyestufl' is isolated by adding common salt. The dyestufl I dissolves in water to blue violet solutions and in concentrated sulfuric acid with bright, bluish-red coloration and dyes wool from an acid bath bluish grey-green tints, while the sodium salt of the dyestufi' diazotized picramic acid+1: 8 2 4 aminonaphtholdisulfonic acid dyes wool blue tints. The dyestuif II dissolves in water with a more reddish tint than the dyestulf I and dyes wool from an acid bath strong greenish-blue tints, which are as the tints obtained with the dyestulf I intermediate between the blue 7 'mcfaeiee aminonaphtholdisulfonic acid and the een dyeings obtained b treating the said irect dyeings subsequent y with a chromate. By

treatin the dyeings of the half chromated dyestu subsequently with a chromate the same shade of the same fastness properties is obtained as bytreating subse uently'with chromate'the dyeings of the sodium salt of the dyestufi. 1

. Instead of the chromium fluorid specified in the examples other salts of chromium as chromium chlorid, chromium sulfate, etc.,' can be emplo ed.

. What we 0 aim is:

1. The described process for the manufac ture of chromium compounds of orthooxydiazobodies, consisting in treating an orthoammophenol compound with a chromium compound in a hot aqueous medium and diazotizing the thus obtained chromium compound of orthoaminophenol-compound.

2. The described process for the manufacture of chromium compounds of orthooxyazodyestulfs consisting in treating an orthoamlnophenol compound with a chromium compound in a hot aqueous medium, diazotizing the chromium compound of orthoaminophenol compound thus obtained and combining the resultin chromium comgoundof orthooxydiazo od y with an azoyestufi component containmg at least one grouprable to be chromated.

3.. he described process for the manufacture of chromium compounds of orthodiazodyestuifs consisting in treating an orthoaminophenol compound with a chromium compound in a hot aqueous medium, diazotizing the thus obtained chromium compound of orthoaminophenol compound,-combining1 the resultin chromium compound of ort ooxydiazobo y with a naphthol compound.

4. The described process for the manufacture, of chromium compounds of orthodiazodyestufl's consisting in treating an ortho-. aminophenolcompound with a chromium compound in a hot aqueous medium; diazo tizing the thus obtained chromium compound of orthoaminophenol compound, combining the resulting chromium compound of orthooxydiazobody with an aminonaphtholsulfonic acid.

5. Asnew products the herein described chromium compounds of orthooxydiazobodies constituting yellow to brown substances soluble in water.

6. As new products the herein described chromium compounds of orthooxyazodyestuflt's, derived from a chromium compound of an orthoozgydiazobody and a further com- Eonent containing at least one group able to e chromated and constituting intense colored powders soluble in water and in concentrated sulfuric acid to intense colored solutions and dyeing animal fibers in acid baths tints whieh are intermediate between 1915, in the presence of two subscribing witthe dyeings obtained with the corresponding nesses. orthooxyazodyestufi's and those obtained by DR. GADIENT ENGI.

treating these" latter ,dyeings subsequently DR. CARL JAGERSPACER. 5 with a chromate. Witnesses: .In witness whereof we have hereunto ARNOLD ZUBER,

signed our names this 30th day of October, Ammo Rrrrnn. 

